Martin boecker



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M. BOEOKER. GAS HEATING DEVI-0E FOR STEAM BOILERS. No. 445,420. I Patented Jan. 27, 1891.

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M. BOEUKER. GAS HEATING DEVICE FOR STEAM BOILERS. No. 445,420. Patented Jan. 2-7, 1891 Fg i'.

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arnnr GAS-HEATING DEVICE FQR STEAM-BOILERS.

SPECIFICATION forming part of Letters Patent No. 45,420, dated January 27, 1891.

Application filed April 8, 1889. Serial No- 306,350. (No model.) 7

To all whom it may concern:

Be it known that I, MARTIN BOECKER, a subject of the King of Prussia, residing at l riedenshiitte, near lllorgenroth, in the Kingdomof Prussia, Germany, have invented an Improved Gas -Heating Device for Steam- Boilers, of which the following is a specification.

This invention relates to a gas-furnace for steam -boilers, and has for its purpose to remedy very important defects generally found in the construction of gas-furnaces hitherto in use. Owing to the cold surfaces of the steam-boilers in general, and of the tubular boilers in particular, the heatinggases are cooled to such an extent that they are not completely burned and a considerable quantity of the same escapes into the chimney without being utilized. Even when a preliminary heating is employed the temperature of the heating-gases cannot be increased to such a degree that the Whole quantity of carbonic-oxide gases will surely be burned. I remedy this detect (the presence of which is proved by a reduced evaporation) by constructing the furnace as shown in the accompanying drawings, in which- Figure 1 is a longitudinal section. Figs. 2 and at are cross-sections taken on lines 1 2 3 4, respectively, of Fig. 1; and 3 is a sectional plan view.

The whole heating apparatus corresponds to the usual arrangement, exceptin the peculiar intermediate construction g, between the chamber for mixing gas and air, and the boiler.

In the drawings,a is the gas-conduit; h, the gas-inlet tubes; 0, the fire-grate for igniting the gases; d, the air-channels, and e e the chamber for mixing gas and air. Above this chamber, and under the tubular boilers f, is masonry g g, arranged in a lattice-work or grate-like form, (see Figs. 1 to this masonry extending under the entire length of the boiler. This lattice-like masonry is heated to a red heat, causing a complete combustion of the gaseous mixture flowing upward before the latter comes into contact With the boiler-surfaces, and the heating is of such an intensitythat any escape of hot unburned carbonic-oxide gases is quite impossible.

In heating the boiler, in order to prevent the gases from being cooled too much by coming in contact with the cold walls of the ma sonry, and to obtain from the commencement a combustion as complete as possible, it is necessary to first maintain a moderate fire on the grate c.

The operation is as follows: Gas enters through the tubes b, passing the grate c, and thence to the chamber e. At (1 the air enters, and, mingling with the heated gas, ignition takes place in the chamber 6. The burning gases then pass up into and through the long straight channels of the lattiee-grating,which distributes the heated gases evenly against the boiler-shell. The grating becomes so heated that even seven or eight hours after cutting off the gas supply the temperature is still of such a high degree that evaporation takes place, and any gases remaining about the chamber 6 and grate c after the cut off and then arriving at the grating are sure to be ignited. From experiment it has been found that with the addition of this lattice-grating between the mixing-chamber and the boiler the steam-producing power has increased about fifty per cent.

The expense of applying this improvement is insignificant, and repairs of the grate-like masonry will hardly have to be made, while on the other hand, since the flame does not strike against single parts of the boiler, but is distributed uniformly, repairs -of the boiler become less frequent. In the accompanying drawings, the grate -like masonry, with the straight channels leading the air and the gases from the mixing-chamber on the one side to the boiler on the other side, is shown as vertically arranged, but it may be constructed in a horizontal or any other suitable position. This arrangement has given excellent results in tubular boilers, and it may be applied with the same advantage in upright and horizontal boilers of any system.

I claim as my invention A gas-furnace for boilers provided with a gas-inlet, an air-inlet, a fire-grate, and a mixing-chamber for the air and gas, in combina- I tion with a lattice-grating between the said mixing-chamber and the boiler, the said gratl' to this specification in the presence of two subing being provided with long straight chan- I scribing witnesses.

nels and extending under the entire length MARHN BOECKER' 5 of the boiler, all substantially as and for the purposes set forth.

In testimony whereof I have signed my name Nitnesses:

MORITZ KNOBLE, FRIEDR. AUG. JAooBs. 

